title: Unexpected regioselectivity switch: organophosphine-triggered reactions of cyclopropene-1,1-dicarboxylates with aldehydes.
abstract: With tris(4-methoxyphenyl)phosphine as the nucleophilic reagent, the readily available cyclopropene-1,1-dicarboxylates undergo a ring-opening reaction to generate a Wittig-type intermediate, which would react with aromatic aldehydes to yield (E)-5-aryl-2-(methoxycarbonyl)-2,4-pentadienoates. It is interesting to observe that the regioselectivity of the ring-opening reaction is switched.
authors.affiliation: State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, P. R. China.
authors.forename: Shengjun
authors.initials: S
authors.lastname: Ni
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
authors.forename: Shengming
authors.initials: S
authors.lastname: Ma